[hackers] [ubase] Fallback to pagesize transfers in dd(1) || sin

[git]

commit 9c7d08773fcd398b50b484c5965438116cdb85e7
Author: sin <s...@2f30.org>
Date:   Wed Jun 4 13:34:13 2014 +0100

    Fallback to pagesize transfers in dd(1)

diff --git a/dd.c b/dd.c
index 994f712..79a3d08 100644
--- a/dd.c
+++ b/dd.c
@@ -41,6 +41,7 @@ prepare_copy(struct dd_config *ddc, int *ifd, int *ofd)
        struct stat st;
        int fli = O_RDONLY|O_LARGEFILE|O_NOCTTY, flo = 
O_WRONLY|O_LARGEFILE|O_NOATIME|O_NOCTTY;
        uid_t euid = 0;
+       long pagesize;
 
        if (ddc->direct) {
                fli |= O_DIRECT;
@@ -68,14 +69,17 @@ prepare_copy(struct dd_config *ddc, int *ifd, int *ofd)
        if (!ddc->bs) {
                struct statfs fst;
                memset(&fst, 0, sizeof(fst));
+               pagesize = sysconf(_SC_PAGESIZE);
+               if (pagesize <= 0)
+                       pagesize = 0x1000;
                if (statfs(ddc->out, &fst) < 0 || fst.f_bsize == 0)
-                       fst.f_bsize = 0x1000;
+                       fst.f_bsize = pagesize;
                if ((unsigned long)fst.f_bsize > (unsigned long)st.st_blksize)
                        ddc->bs = fst.f_bsize;
                else
                        ddc->bs = st.st_blksize;
                if (ddc->bs == 0)
-                       ddc->bs = 0x1000;
+                       ddc->bs = pagesize;
        }
 
        /* check if device or regular file */